Planting Perennial Roots
It is a good idea to soak any bare-root perennials in water for a few hours, but no more than a day, before planting. Add organic matter to the area and provide good drainage unless the variety can tolerate wet soil. Unless otherwise specified, bare-root perennials are usually planted with the crown (where the roots meet the shoots) an inch below the soil surface. Firm soil gently to eliminate air pockets and water in well. Mark the area clearly since it may be a while before the plant shows itself.
Perennials in pots should be watered well before planting. Loosen any tight roots and plant at the same depth as the plant was in the pot. If the leaves were green and growing, you should protect them from frosts with straw mulch, Remay or an old blanket. If white or pale yellow shoots or leaves developed during storage, protect them from wind and harsh sun with Remay or a burlap screen, until they green up.
Pay particular attention to watering any new plants during the first season. Once established most plants are drought tolerant
